Update README and CHANGELOG

CHANGELOG.md

 # Changelog
 
+## [0.6.0]
+
+- Add TOTP as second factor authentication. Please note that you'll need to set
+  a `backend.dashboardUrl` value instead of the old `backend.loginPanelUrl` one
+  -- typically dropping the `/web` suffix to get the new value.
+
 ## [0.5.2]
 
 - Fix login welcome message

README.md

@@ -104,7 +104,8 @@ The application will run on `http://stackspin_proxy`. Add the following line to
 #### 4. Kubernetes access
 
 The script needs you to have access to the Kubernetes cluster that runs
-Stackspin. Point the `KUBECONFIG` environment variable to a kubectl config. Attention points:
+Stackspin. Point the `KUBECONFIG` environment variable to a kubectl config.
+Attention points:
 
 * The kubeconfig will be mounted inside docker containers, so also make sure
   your Docker user can read it.
@@ -121,3 +122,23 @@ After you've finished all setup steps, you can run everything using
 This sets a few environment variables based on what is in your cluster
 secrets, and run `docker compose up` to build and run all necessary components,
 including a reverse proxy and the backend flask application.
+
+## Testing as a part of Stackspin
+
+Sometimes you may want to make more fundamental changes to the dashboard that
+might behave differently in the local development environment compared to a
+regular Stackspin instance, i.e., one that's not a local/cluster hybrid. In
+this case, you'll want to run your new version in a regular Stackspin cluster.
+
+To do that, make sure to increase the chart version number in `Chart.yaml`, and
+push your work to a MR. The CI pipeline should then publish your new chart
+version in the Gitlab helm chart repo for the dashboard project, but in the
+`unstable` channel -- the `stable` channel is reserved for chart versions that
+have been merged to the `main` branch.
+
+Once your package is published, use it by
+1. changing the `spec.url` field of the `flux-system/dashboard`
+   `HelmRepository` object in the cluster where you want to run this, replacing
+   `stable` by `unstable`; and
+2. changing the `spec.chart.spec.version` field of the `stackspin/dashboard`
+   `HelmRelease` to your chart version (the one from this chart's `Chart.yaml`).